Why is the hardy weinberg theorem important?

Answer 1

it helps us determine if something will evolve or not

Answer 2

It was a theory and a mathematical principle that allowed us to predict the offspring in a perfect situation. Frequency, phenotype, allele, etc.

It had to follow these 5 rules
no natural selection
no emmigration/immgration
random mating
large population
no mutation

In theory it sounded great, in reality, it'd never happen

The mathematical principles are

p + q = 1
and
p^2 + 2pq + q^2 = 1

p = dominant allele
q i= recessive allele

Answer 3

It shows why a population with the conditions the 1st answer stated will maintain essentially the same ratio of alleles, phenotypes and genotypes over time. For example, it demonstrates why, if blue eyes are recessive to dark eyes, the trait nevertheless does not die out.